Easun Firmware Update < Premium – 2025 >

: Ensure your laptop is fully charged or plugged in to prevent an interruption during the 5–15 minute process. Firmware Update Procedure

Provide a clear photograph of the silver specification sticker. Provide your current U1 and U2 firmware versions.

: Ensure the inverter is connected to a stable battery source (preferably fully charged) and your laptop is plugged into power to prevent a shutdown during the process.

This feature enables users to update the embedded firmware of EASUN power inverters (e.g., Solar, Off-Grid, Hybrid series) to improve performance, add new functionalities, or resolve known issues. The update process supports both local (USB/RS232) and remote (WiFi/Bluetooth dongle) methods.

Open your computer's and check under "Ports (COM & LPT)" to confirm which COM port number (e.g., COM3) has been assigned to the cable. easun firmware update

Updates often add support for newer lithium battery profiles (BMS) or improve charging algorithms (Lifepo₄ and Li-ion).

Contact official Easun support or your authorized reseller with a photo of your inverter's silver side-sticker (showing the serial number and exact model specs) to request the correct file.

If your laptop does not have a serial port, you must have a reliable USB-to-RS232 adapter.

Open the firmware update tool (reflash.exe) provided by EASUN. : Ensure your laptop is fully charged or

A Windows laptop is typically required to run the reflashing tool. 3. Step-by-Step EASUN Firmware Update Procedure

Load the firmware file (often named something like inv_app_xxx.hex ). Step 4: The Update Process

Before updating, identify your current main CPU and remote panel version using the WatchPower app. This ensures you do not downgrade or install incorrect firmware. Step 2: Connect the Inverter

: Easun provides manuals and some software links on their official help center . : Ensure the inverter is connected to a

: If the tool rejects the file, do not force it. Verify the model version with the seller again. Stuck at 0%

Most modern Easun units are updated using a Windows laptop running a proprietary manufacturing utility like , WatchPower , or a standalone ISP (In-System Programming) Tool . Step 4.1: Preparation and Isolating the Inverter

A progress bar will appear on your laptop screen. This process typically takes between 3 to 10 minutes.